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A fragment of aluminum that appears to have been made by hand is being claimed as 250,000-year-old evidence that aliens once visited Earth in the long distant past. Metallic aluminum was not being produced by mankind until about 200 years ago, so this find of a large chunk that could be around 250,000 years old is held as a sensational discovery. The exact details of the find were never made public at the time for the reason that the metal was excavated in communist Romania in 1973. The discovery was made when builders that were working on the shores of Mures River found three objects that were 33 feet (10 meters) underground.

All three objects were sent together to be further analyzed by archaeologists in Cluj, the main city of the Romanian region of Transylvania. They quickly determined that the two large bones had belonged to an extinct mammal that died out around 90,000 years ago. The third object stunned the experts since it was a piece of lightweight metal, and seemed to have been manufactured. The object is 7.8 inches (20 centimeters) long, 4.9 inches (12.5 centimeters) wide and 2.8 inches (7 centimeters) thick.

The experts were puzzled by the fact that the piece of metal has concavities that make it seem that it was manufactured as a component of a more complex mechanical system.